標題: Electrical conduction processes in ZnO in a wide temperature range 20-500 K
作者: Lien, Chien-Chi
Wu, Chih-Yuan
Li, Zhi-Qing
Lin, Juhn-Jong
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 15-九月-2011
摘要: We have investigated the electrical conduction processes in as-grown and thermally cycled ZnO single crystal as well as as-grown ZnO polycrystalline films over the wide temperature range 20-500 K. In the case of ZnO single crystal between 110 and 500 K, two types of thermal activation conduction processes are observed. This is explained in terms of the existence of both shallow donors and intermediately deep donors that are consecutively excited to the conduction band as the temperature increases. By measuring the resistivity rho(T) of a given single crystal after repeated thermal cycling in vacuum, we demonstrate that oxygen vacancies play an important role in governing the shallow donor concentrations but leave the activation energy (similar or equal to 27 +/- 2 meV) largely intact. In the case of polycrystalline films, two types of thermal activation conduction processes are also observed between similar to 150 and 500 K. Below similar to 150 K, we found an additional conductionprocess due to the nearest-neighbor-hopping conduction mechanism, which takes place in the shallow impurity band. As the temperature further decreases below similar to 80 K, a crossover to the Mott variable-range-hopping conduction process is observed. Taken together with our previous measurements on rho(T) of ZnO polycrystalline films in the temperature range 2-100 K [Y. L. Huang et al., J. Appl. Phys. 107, 063715 (2010)], this work establishes a quite complete picture of the overall electrical conduction mechanisms in the ZnO material from liquid-helium temperatures up to 500 K. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3638120]
URI: http://dx.doi.org/10.1063/1.3638120
http://hdl.handle.net/11536/14790
ISSN: 0021-8979
DOI: 10.1063/1.3638120
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 110
Issue: 6
結束頁: 
顯示於類別:期刊論文


文件中的檔案:

  1. 000295619300061.pdf